上顎第 1 小臼歯の計測値による咬合面形態

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Measurements have been conducted on the occlusal surface that was expressed in terms of the straight line between the tips of both buccal and lingual cusps and the largest distance of the marginal ridge as measured horizontally against the tooth axis. Relative magnitude of the mesio-distal and bucco-lingual diameters of this occlusal surface and comparison of these diameters with those of the whole tooth crown have been respectively studied. Results obtained were summarized as follows. 1) With both mesio-distal and bucco-lingual diameters of the occlusal surface the male tooth exceeded the female tooth in magnitude. 2) With both sexes, it was revaled that the bucco-lingual diameter was smaller than the mesio-distal diameter in the occlusal surface. This represented a converse relation as contrasted with the measurements on the whole tooth crown 3) There was noticed little difference of values in magnitudes between the teeth of left and right dental arches with both sexes. 4) No appreciable difference was also noted between the teeth of both sexes with respect to the values of indices. These indices again showed inverse relation with those indices obtained from the measusucements of whole tooth crown. 5) It may be concluded from the present date that the form of the anatomical occlusal surface of the upper first premolar can be defined as being semi-oval, having mesio-distally longer, although the form of the whole tooth crown generally appears flattened mesiodistally.
九州歯科学会の論文
1965-06-30

上顎第 1 小臼歯の計測値による咬合面形態

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